fix: use correct operator precedence in URL construction

[rileychh]

When HTTP support was added (d193310), a regression was introduced that caused all HTTPS URLs to return only https without the rest of the URL:

[Threads](<https>) • [@***](<https***>) • [FixThreads](https)

This is caused by Python's operator precedence — + binds tighter than the ternary if/else, so:

"https" if self.is_ssl else "http"
+ "://{domain}"
+ route_repl

evaluates as:

"https" if self.is_ssl else ("http" + "://{domain}" + route_repl)

Since is_ssl defaults to True for all websites, get_repl() always returns just "https".

The fix adds parentheses around the ternary expression:

("https" if self.is_ssl else "http")
+ "://{domain}"
+ route_repl

[Kyrela]

I'm dumb af, thanks for this fix!